Title (en)

METHOD AND APPARATUS FOR COMPENSATING FOR THE RESIDUAL BIREFRINGENCE IN INTERFEROMETRIC FIBER-OPTIC GYROS

Title (de)

VERFAHREN UND VORRICHTUNG ZUM KOMPENSIEREN DER RESTDOPPELBRECHUNG IN INTERFEROMETRISCHEN FASEROPTISCHEN KREISELN

Title (fr)

PROCEDE ET APPAREIL DE COMPENSATION DE LA BIREFRINGENCE RESIDUELLE DANS DES GYROSCOPES INTERFEROMETRIQUES A FIBRE OPTIQUE

Publication

EP 0666976 B1 19990217 (EN)

Application

EP 94901214 A 19931027

Priority

• US 9310300 W 19931027
• US 96779592 A 19921028

Abstract (en)

[origin: WO9410536A1] An interferometric fiber-optic gyro system (100) includes a light source (101) and a plurality of optical fiber rings (120, 121, 122) employed to measure angular displacement along three axes (x, y, z). Optical circuit elements interposed between the source and the rings include an optical switch (104) for periodically applying the optical signal to each of the rings individually along three separate optical transmission paths (134, 136, 137). Included, in each of the optical transmission paths is a modal filter (113, 114, 115), including a polarizer, and a beam splitter (116, 117, 118) which provides two separate beams to the optical ring for counter-propagation through the ring. Compensating birefringent devices (110, 111, 112) are added in the optical circuits to compensate for a residual birefringence introduced by the various optical elements in the circuits.

IPC 1-7

G01C 19/72

IPC 8 full level

G01C 19/72 (2006.01); G02B 6/00 (2006.01); H01S 3/07 (2006.01); H01S 3/083 (2006.01)

CPC (source: EP US)

G01C 19/721 (2013.01 - EP US); G01C 19/728 (2013.01 - EP US)

Designated contracting state (EPC)

FR GB IT

DOCDB simple family (publication)

WO 9410536 A1 19940511; EP 0666976 A1 19950816; EP 0666976 A4 19960703; EP 0666976 B1 19990217; JP 3687971 B2 20050824; JP H08503068 A 19960402; US 5365337 A 19941115

DOCDB simple family (application)

US 9310300 W 19931027; EP 94901214 A 19931027; JP 51128094 A 19931027; US 96779592 A 19921028